Metal-boring apparatus.



W. H MARKLAND. METAL BORING APPARATUS.

APPLICATION FILED MAR. 19, 19.10. 1,012,091, Patented Dec. 19,1911.

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W. H. MARKLAND. METAL BORING APPARATUS. APPLICATION FILED 111111.19, 1910.

Patented 11 16.19, 1911.

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W. H. MARKLAND. METAL BORING APPARATUS. APPLIGATiON FILED MAR.19, 1910.

1 PatentedDec. 19, 1911.

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' W. H. MARKLAND. METAL BORING APPARATUS.

APPLICATION FILED MAR. 19', 1910. k 1,012,091, Patented Dec. 19, 1911 4 SHEETS-SHEET 4.

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I Specification of Letters Patent.

Application illed liarch 19, 1910. Serial No. 550,508.

To all whom it may concm': V

Be it known that I, WYLLIS. H. MARK- LAND, a citizen of the United States of America, residing in the city of Altoona, count of Blair, and State ofPennsylvania,

have invented a certain new and useful Improvement in Metal-Boring Apparatus, of

which the following is a true and exact description, reference being had to the accompanying drawings, which,form a part thereof.

My present invention relates to boring apparatus, and particularly metal boring apparatus, and was primarily devised, and is peculiarly adapted, for boring out thethe latter, that when the boring. bar ismoved through the axle receiving hole of a car wheel or like object in one direction a roughing cut will be taken with the finishing cutters retracted, and atthe completion of the roughing cut the finishing cutters are thrown into position tofinish the hole on the return movement of the boring bar. By preference, the mach ne 1sprovided with mechanism for'automatically shifting the finishing cutters and reversingthe movement of the boring bar at the completion of the roughing cut.

Other objects of the invention are to improve the apparatus in various features, some relating particularly to the boring bar proper and others to the mechanism for giving the boring bar the reciprocatory movements. 4

The various features of novelty which characterize my invention are-pointed out with particularity in the claims annexed to and forming a part of this speclfication. For a better understanding of the invention, however, and the advantages possessed by it, reference may be had to the accompanying drawings and descrlptlve matter in which I have illustrated and de-- scribed one of the forms which the invention may be embodied.

Of the drawings, Figure 1 is a front elevation of an assembled machine primarily I devised for boring out .carwheels. Fig.1

is an elevation, with arts broken away and in section, taken simllarl to Fig. 1, but 'on a larger scale and showlng a portion only of the apparatus shown in Fig. '1. Fig. 2

r is a side elevation of the machine." Fig. 2

Patented Dec. 19, 1911.

is a plan View of a portion of the machine showing the clutch shifting mechanism. Flg. 3 isan enlarged front elevation of the boring bar proper. Figs. 4, 5, 6 and 7 are transverse sect1ons taken on the line 4'4,

5 5, 66and 77, respectively, of Fig. 3.

Fig. is an elevation, partly in section, on the line 8-8 of Fig. 3. Fi 9 is an eleva- ..tion of one of the parts 0 the cutter adjusting mechanism. Fig; 10 is a section on the linelO-lOtf Fig. 9. Fig. 11 is an elevation of another of the parts \of the cutter adjusting mechanism. Fig. 12 is a'section on the line 12-'12 of Fig. 11. Fig. 13 is an enlarged section taken similarly to Fig. 8, but showing a portion only of the apparatus there shown. line 1414 of Fig. 13.v

In the drawings, A

for. the rotating work holding chuck B. The specific construction of the chuck and the mechanism for rotating it form no part of the present invention and are not illustrated-herein. .The frame is formed with an arm or goose neck extending above the chuck B and provided at its upper end with a vertical guiding sleeve or housing A 'for a ram or boring bar spindle C. The spindle C is provided at its upper end with a head C to which is pivotally connected one end of the counter balancing lever D. The lat ter is pivotally supported in the frame work A by the yoke A and carries at its free end a counter weightI). The spindle C has mounted in its lower] end in the usual manner, the boring bar-K proper. The .boring bar K carries at its lower endroughing cutters L, and a short distance above the roughing cutters, finishing cutters M.

In' the operation of boring out a car wheel the boring bar is first moved down through the wheel into the position shown in Figs. 1 and 2, and on this downward stroke of the boring bar the roughing cuttersL roughcut the axle receivingpassage X. in the wheel X. After the borlng bar has been moved down into the position shown in Figs. land 2, in which the finishing cutters M are below the lower end of the passage X, the

Fig. 14 is a section on the" V represents the frame of the boring mill 'formed with asupport' cutters M are thrown out into operating as bya set screw. Tripping bar H passes position and the boring bar is then retracted, thus giving the passage X 'itsfinishing out. After the boring bar is moved above the wheel the latter may be removed and replaced by another. It will be understood that during the operations described, the wheel is rotated by the chuck B and that the ram and boring bar have axial but no 'rotat-ing movement.

The ram or spindle Cisprovided at one side with a longitudinally extending rack bar C. Thelatter is in mesh with a pinion E (see Fig. 1) carried by a transverse shaft E. The shaft E has secured to it at its outer end a hand wheel E, by means of which the shaft may be rotated by hand, and a locking mechanlsm comprising a hand wheel E is provided for detachably looking a gear. wheel E? to the shaftE for power actuation. The gear wheel E meshes with a driving worm F secured to aspindle F on which is splined a movable clutch member G. The latter may be shifted axially of the shaft F to engage a right hand clutch member G or a left hand clutch member Gr.

-The right hand clutch member G is secured on the end of the driving shaft G which rotates in the direction to, raisethe ram C when clutch members G and G arein en-,

gagement. By means of a counter shaft Gr and gearing connecting the counter shaft to the shaft G and to a gear mounted on the stub shaft G (see Fig; 1) the shaft G serves to rotate the clutch member G" in a direction opposite to that in which the shaft G rotates. In consequence, when the clutch member G is shifted so that it engages the clutch member G the shaft F is rotated in a direction to move 'the ram or spindle C down. T have not thought it necessary to illustrate the gearing and clutch mechanism referred to in much detail, as the specific construction of these parts are well known arm for the bell crank, the springs servingto make the arm yielding so that in case of improper adjustment of the arm relative to the actuating mechanism hereinafter described, such improper adjustment will not cause injury to the parts. v I

To automatically shift the bell crank arm G into the position'shown in Fig. 2, in which the clutch members G and G are in engagement, a pin H is adjustably securedte a seller H secured on thetripping bar li-ll through and is guided by an ear A at the lower end of the frame sleeve A and through an ear or bracket C extending laterally from the head C of the spindle C. Collars I and I are slidingly mounted on the tripping bar H above and below the collar H.

Between the sliding collar I and the fixed' collar H a helical spring I surrounds the rod H. The collars I and I are connected together by rods I which are slidingly received in apertures provided in the collar H. At the upper end of the housing sleeve A is pivoted a latch J adapted to engage a collar H on the tripping bar H to hold the latter elevated under certain conditions as hereinafter explained, and to thereafter release the collar H when engaged by sliding collar 1 A pawl or looking dog J, pivoted to the spindle carried ear C and adapted under one condition .to enter the notch H in the tripping bar H, is provided with an extension J adapted to be engaged by the frame carried stop A which may be adjustable to carry the dog J out of the clutch H urging the latter into the position in which it enters the beveled notch H formed in the tripping bar H. The clutch shifting bell crank lever may be heldby friction in any position' in which it has been moved until the bell crank is positively moved into another position.

The apparatus, as shown in Figs. 1, 1 and 2, is in the position for making the finishing cut. lln this condition of the parts the tripping bar H is secured to the spindle G by a detent J which is entered in the notch H", the rod' H has engaged the arm G to shift the clutch member G into engagement with clutch member G and the plate or arm H secured to the lower end of the tripping bar H,through the pin H entering cam slot T in the cutter shifting 1 member T has thrown the finishing cutters M into operating position in a manner hereinafter described. With this condition of the apparatus, the rotation of the shaft G causes the spindle C-to be raised to thereby make the finishing cut. The upvardmovement of the spindle is continued until the trip collar H adjustably secured to the tripping bar H engages the clutch shifting arm G and thereby shifts the sliding clutch member G out of engagement with the clutch member G When this occurs, further movement of the spindle is hand after, the clutch mechanism has been corresponding return movement ofthe; bar H because the pawl J is then in engage-' ment with the collar H fiked to the trippingbar H, and the bar H-remains stationary untilthe descent of the spindle C brings; the collar I into position to engage the pawl-J and carry it outof engagement with c'ollarI-R, This doesnot take place until after the locking dog J has been carried down into the position in which it snaps into the notch H. The relative movement of the spindle and tripping b'ar'occu'rring prior to the-disengagement of pawlJ and collar H througharm H and cutter shifting device T retract the finishing cutters as hereinafter described. After the pawl J is forced out of engagement with collar H the tripping bar H and spindle C descends toand indeed until the cutter Y has/ rounded the upper end or mouth of the passage" X: When this is completed the pawl- J is forced out ofthe notchH by the en agement' of the pawl arm'J with the rame stop A whereupon the spring I, putunder tension by the movement of thecollar I toward the trippin g rod carried collar H while the tripping rod was preventedfrom {moving down with the spindle C through pawl J, forces the tripping rod H .down' with a snap action to cause the arm-H and the cutter shiftingdevic'e T to throw the finishing cutters M out. into the operatiI? position, and at the came time the rod 1 \i carried by tripping rod H engagesclutch' -'shifting arm G and throws clutch member G. into engagement with clutch-member G to thereby bring about the return or finishlar H" engages the frame bracket ear 'A to limit the downward movement-oftrip rod H under the action of spring-1' when pawl J is carried outof notch H 1 w The boring bar K is proyidedl'with the usual tang K adapted to be received in a socket (not shown) in the boring bar'. At its lower end the boring Bar K is. provided with transverse sockets tor-the roughing screws L and may be adjusted in' thedirec tionv of their length by screws L to adjust the diameter 6f thehole cut bythese cut ters. -The finishing cuttersM project from the opposite ends of a' transverse passage The initial return movement of the preferably provided gether until the finishingrcut is completed,-

ing cut movement of the spindle; The colcutters L which are clamped in place by formed. in the boring bar a short distance above the sockets forthe roughing cutters. The finishing cutters are provided at their outerends with, sockets receiving the ends of flat springs M secured to the boring bar 7 k and tending to force the'cutters M into the boring bar. The inner ends M of the cutters M are oppositely beveled. The cutters M are filmed out' as desired by the wedge Y shaped end N of a plunger N which is.75 "axially movable in a' sleeve 0 mounted in an aiial passage K formed in the boring bar. The sleeve 0 is formed with a collar 0 atits upper end which fits snugly in the upper-end of the passage K and is prevented from movement therein by one or more screws 0 The bodyof the sleeve 0 is of an external diameter somewhat less than the diameter of passage K to permit the sleeve'to be adjusted as by the screws 0, extending parallel to the, cutters M- to thereby adjust one cutter in, and the other cutter out, to compensate for any inequality of the parts due to unequal wear or the like cause. l To obviate unnecessary motion of the sleeve 0 in a direction transverse to the "length of the cutters -M, the sleeve 0 is at its lower end with ears or shoulders O, the diameter of the curved surface ofwhich is only slightly less than thatfot the passage K. The plunger N is normally urged upward by a spring 0 which bears at its lower end against the bottom of an enlargement of the bore of the sleeve O and at its upperend against a'collar N secured to the plungerN. The upperend of the plungerds beveled at N and 'engages'against the corresponding beveled surface P of a 'notch formed in the underside of'theplunger Pwhich is nfovable in a transverse passage K formed in the bor-- ing bar. A spring P urges the plunger P to the right as viewed in Fig; 8, in the directioni in which splun'ger P- must move to' permit plunger N to rise and thereby permitthe finishing'cutters M to be retracted A .key"P* carried by the plunger P and= worlnng in a keyjway' formed in the boring bar, prevents rotative meveinent of the plunfger I. At its right hand end,4the plunger P is formed with athreadedsOcket Ps rreceiving a threaded, extension Q," of-the adjusting head or dial member Q. The index member Q, is surrounded by an annular -member R provided with an internal coll'arr R' 'which engages the outer 'end of a' rib. formed at the periphery of the member Q so that, when .the' member is .rnoved in a toward the axis [of the boring bar the in-' 12 dex head Q will'be correspondingly moved, and through the lock formed-by the-.threa'd-T -ed connection between members Q and P,

the latter also will be moved inward. The V member-R is, surrounded an annular 1' 0 member S formed with an internal rib S engaging the outer end' of a shoulder formed on the periphery of the member B. The member S is held by pins S against rotative movement about its own axis relative to the boring bar, but has freedom for movement in a direction parallel to its axis, as hereinafter described. The member R is normally held against rotative movement about its own axis by means of the set screw R see Fig. 5) by the member S but by loosening the set screw R the member R may be angularly adjusted to thereby angularly adjust the index point R carried at the outer end of the member R. The index point R serves as the zero point for the scale carried at the outer end of the dial member Q. The latter may be rotated as by a tool inserted in the socket Q to thereby adjust the plunger P relative to the memberQ through the threaded connection between the plunger and the member Q. The member S is formed in its face with a plurality of pockets S one side wall S of each pocket being beveled. In front of the member S is mounted an annular member T which is formed on its back side with teeth T each having one side edge T beveled to correspond to the beveled edge S In one adjustment of the apparatus shown in Figs 13 and 14, the teeth T enter the pockets '5", in which case the front'side proper of member S is engaged by the back .side proper of the member T, as shown in Figs. 13 and 14. In another position of the parts shown in Fig. 8 the teeth T ride up on the body surface of the member S, thus spreading the members S and T apart and forcing the former inward. Since the plunger P moveswith the member S, the finishing cutters M are forced out when the members N and T are spread apart, and are retracted when the member T is moved to permit the teeth T to enter the pockets S formed in the face of'the member S. The member T is held in position by .anannular guide member U formed with a shoulder U which bears against the outer end of a shoulder formed on the periphery of the member T. The member U is secured in place byscrews To shift themember P axially and thereby force out the finishing cutters M or permit them to be retracted the arm T is rigidly secured to the member T. This, arm is formed with an inclined cam slot T receiving a pin H carried by the arm H secured to the end ofvthe tripping bar H previously described. To properly guide the member T it is formed at its upper end with a slot receivingthe plate or guide W secured to theboring bar. To hold the member T in each of its two operative positions two shallow sockets T are formed in its socket formed in the boring bar and spring pressed into the position in which it enters the sockets T The general operation of the mechanism will be plainly apparent to those skilled in the art from the drawings and the foregoing description. Attention is called to thefact that by rotating the member Q, the position and the angle of the beveled surfaces N 'and P and the angle of the surfaces of the wedge end N of the plunger N and the corresponding surfaces of the cutters M, rotation of the member Q, can be caused to produce definite and easily read variations in the diameter of the hole bored by'the cutters M. For instance, in the practical use of the invent-ion I have so proportioned these parts that an adjustment of the head Q through an angle corresponding to one unit of the scale indication produces change in diameter of the hole cut of 1/1000 of an inch.

the adjusting screws 0 hold the sleeve 0 in different positions to compensate for smallvariations in the way in' which the tools M are ground, these screws are not always necessary to the successful use of the invention, and in some cases I prefer to temporarily or permanently dispense with the screws 0 even while providin freedom of movement of the lever 0- relative to the operating bar K. In such cases the cutters M will float, so to speak, and will adjust themselves to the hole being bored even if the latter, is a trifle out of true with "respect While, as before stated, I may through i to the axis of the operating bar as is not unfrequently the case'where the roughing cut hasbe'en taken under conditions, known-to those skilled in the art, which are conducive to the boring of a hole slightly out of true.

The construction described is simple and 1 efl'e'ctive in operation and I have found in actual practice that it permits of boring the The provisions for l of two mills of this character by a single 1 operator. I

While in accordance with the provisions of the statutes I have herein illustrated and described the best form of my invention now known to me, it will obvious to those.

skilled in the art that many changes in four? may be made without departing from the spirit of my invention, and that some features of the invention may advantageously be employed in some cases without a corresponding use of other features, and in particular that it may sometimes be desirable todispense with the automatic mechanism for shifting the clutches by which the direction of movement of the boring bar is re-' callyshifting the cutters relative to the bar,

into a position during' a movement of the bar in one direction, different from that occupied by them during the preceding movement of the bar in the opposite direction.-

2. Ina boring mill, the combination of a boring bar, means for giving it a to and fro movement, a set of cutters carried thereby and sharing in said movement, and means dependent on said movement for automatically extending the cutters from one ,position occupied by them relative to the bar during a movement of the bar in one direction, into a second position, and maintaining them in said second'position durin the movement of the bar in the opposite (firection. v

3. In a boring mill, the combination of a boring bar, means for giving the bar a to and fro movement, and two sets of cutters carried by said bar, one set being adapted to operate during a movement of the bar in one direction, and the other set being held in an inoperative position during the movement of the bar in said one direction and adapted to be extended into the operative position when the bar is making its return movement, and mechanism for automatically shifting said second set of cutters in accordance with the movement of the boring bar.

4. In a boring mill, the combination of a boring bar,, means for giving the bar a to and fro movement in the direction of its length, a set of cutters carried by the bar adapted to make a rough cut during a move-' ment of the bar in onedirection, a set of finishing cutters carried by the bar for making a finishing cut on the return movement of the bar, said finishing cutters being movable from one position in which they do not extend far enough to engage the surface cut by the first set of cutters, to a second position in which they extend far enou h to engage and finish said surface, an mechanism for automatically shifting the finishing cutters into said second position after the conclusion of the roughin cut.

a set of cutters movably mounted therein, of

actuator pivotally mounted on said bar, to turn relative thereto about anaxis transverse the latter; saidactuator and said member being-provided with cooperating cam surfaces, whereby, when'isaidyactuator is turned on its axis, said 'member is moved transtions between said cutters and said movable member whereby the movement of the latter transverse to the axis of the bar shifts said cutters. v

'6. The combination, with a boring bar and movable actuator, and a second movable vided with cooperating cam surfaces, and adjustable connections between sa1d second member and the cutters, whereby said cutters actuator and said movable member.

' ,7. The combination, with a boring bar and a set of cutters movably mountedtherein, of a cutter shifting mechanism comprising a member mounted on said boring bar, said actuator and said second movable member being provided with cooperating cam surfaces, a third member adj ustably connected to said second member, and means whereby the movement of said third member shifts'said cutters. g a

8. In a boring mill, the combination, with ably mounted in the bar, and means f r shifting the cutters as the bar moves baci and forth, including an operating member, means holding the member against movement with the bar during an initial movement of the latter in one direction, and automatically rendered ineffective at the nd of said initialmovement, resilient means acting between the member andb r and put under tension when the member is held against movement with the bar by said holding means, other means preventing relative movement between the bai and member unsaid holding means are first rendered ineffective, and means for rendering said second holding means ineffective after ther movement in the same direction of said bar, and connections whereby said cutters are shifted by the relative movement of said operating member and said movable member.

a cutter shifting mechanism comprising an to the axis of the bar, a member mounted on said bar to move transversely of the axis of' versely to the axis of the bar, and connec-- a set of cutters movably mounted therein, of a cutter shifting mechanism comprising a member mounted on said bar, said actuator and sa1d second movable member being proa fur- 5. The combination wit aaboring bar and are shifted by the relative movement of said movable actuator and a second movable.

the boring bar, and means for giving ita to and fro movement, of a set of cutters movder the ac ion of said resilient means when 9. In a boring mill, the combination, with the boring bar, and means forgiving it a to and fro movement, of a set of cutters movably mounted in the bar, and means for shifting the cutters as the bar moves back and forth," including an operating member, and connections whereby I said cutters are shifted by the relative movement of said operating member and said movable member, means holding the member" against movement with the bar during an initial movement of the latter in one direction, and automatically rendered ineffectiveat the end of said initial movement, resilient means acting between themember and bar and put under tensibn when the member is held against movement with the bar by said holding means, other means preventing relative movement between the bar and member under the action of said resilient means when said holding means are :first rendered ineffective, and means for rendering said second holding means ineffective after a further v movement in the same direction of said'har,

and mechanism for reversing the movement of the bar actuated by the movement of said member relative to the bar occurring when said second holding means is rendered ineffective.

10. In a boring mill, the combination, with the boring bar and means for giving it a to and fro movement, of a set of cutters mov, ably mounted in the bar, and means for shifting the cutters at predetermined points in the movement of the bar including an opcrating member, means for holding the memher againstmovement relative to the bar during intermediate portions of the movement of the bar in each direction, and means for moving the member relative to the bar in one direction at one end of the to and fro movement of the bar and in the opposite direction at the op osite end of the to and fro movement of the er, and connections whereby, said cutters are shifted by the relative movement of said operating member and said mdvable member.

11. In a boring mill, the combination, with the boring bar and means for giving it a to and fro movement, of a set of cutters movably mounted in the bar and means for shifting the cutters at predetermined points in the movement of the bar including an operating member, means for holding the member against movement relative to the bar during intermediate ortions of the movement of the bar in eac direction, and means for moving the member relative to the bar in one direction at one end of the to and fro movement of the bar and in the opposite direction at the opposite end of the to and fro movement of the bar, and clutch mechanism controlling the to and fro movement of the bar actuated by said member as it reaches the ends of its path of movement.

ne aoa'i ably mounted in the bar, and means for V shifting the cutters at one end of the stroke of the bar, including an operating member,

means for holding the member against movement relative to the bar during the intcrmediate portion of the movement of the bar V toward said one end of its movement, means for moving the member relative to the bar as a the latter reaches said one end of its movement, and mechanism actuated by said mem-' ber on said relative movement for reversing the movement of the bar.

13. The combination, with a boring bar and a set of cutters movably mounted therein, of a cutter shifting mechanism comprising a plunger slidingly mounted in said bar I and'provided witha head and a threaded connection between said plunger and the head thereof, resilient means urging the plunger in one direction, and means for moving the plunger in the opposite direction, comprising an actuator mova'blymounted onsaid bar, and camming provisions acting between said head and actuator.

14. The combination, with a boring bar and a set of cutters movably mounted therein, of acutter shifting mechanism comprisin a plunger slidingly mounted in said bar an having a compound head comprising a central portion in threaded engagement with ,the plunger to permit the head to be adjusted toward and awayjfrom the plunger, and a second portion, an actuator member movably secured to the bar, said actuating member and said second portion being provided with cooperating cam surfaces whereby when said actuating member is moved the plunger is caused to move away from or said actuating member, and provisions whereby the movements of the'plunger cause the cutters to be shifted.

15. The combination, with a borin bar and a set-of cutters movably mounted t erein, of a cutter shifting mechanism comprising a plunger slidingly mounted in said bar and having a compound head comprising a central portion in threaded enga ment with the plunger to permit the hea and a second portion, an actuator mem er movably secured to the' bar, provisions ineluding coiiperating cam surfaces on said actuating member and said second portion whereby when said actuating member is moved the plunger is caused to move relatively to said actuating member, resilient means for'urging the plunger toward said to be ad justed toward and away from the plun' er,

allowed to move toward the actuating member, means for urging the plunger toward,

actuating. member and provisions whereby the movementsofthe plunger cause the out:

ters to be shifted,

' held 16; The combination, with a boring bar and a set'of cutters movably mounted therein, of a cutter shifting mechanism compris-' inga plunger slidingly mounted in said bar and havinga com ound head formed of one member connecte to the body of the plunger by a threaded connection and rotatable to adjust the head toward and away from the plunger, a member surrounding the first mentioned member and provided with an index mark whereby the rotary adjustment of the first member may be measured, said sec ond member being rotatable to adjust the set tin of the index mark, and a third member against rotative movement, and a rotatable actuating member pivotallyconnected to the loan, said actuating member and said third member being provided with cam surfaces whereby when the actuating member is rotated, .the third member is moved also, said first, second and third members having engaging portions whereby the movement of the third member causes a movement of the entire head and thereby of the plunger, re-- silient means for moving the plunger in adirection' opposite to 7 that in which it is moved by the rotation of the actuating memher, and provisions wherebyfthe movement ofthe plunger causes the tool to be adjusted.-

17. The combination, with a boring bar having a longitudinal passage formed in it and intersectin transverse tool receivilig passages, of too s located in "said transverse passages, a plunger mo'untedin said longitudinal passage, said tools and plunger having cooperatingwedging surfaces whereby \when the lunger is axially adjusted the tools are a justed transversely of said-bar, means for; axially. adjusting said plunger, said plunger being mounted'to permit its lower end to move transversely to the boring bar, and means for adjusting the lower end of said plunger transversely of the boring bar. v I 18: The combination, with aiboring bar.

having a longitudinal passage'formed in' it' and intersectlng parallel transverse tool receiving passages, of tools located in said. transverse passages, a sleeve mounted in said longitudinal passage, means for adjusting the lower end of said sleeve transversely ofsaidpassage in a dire tion parallel to the direction. of the tool eceiving passages, aplunger slidingly mounted insaid sleeve, said tools and plungerhavingcooperating. wedging surfaces whereby when the plunger slidingly adjustedin said sleeve the tools 'are forced. outward, and means for: slidingly adjusting 'saidplunger; 4

19; The combination, with a' boringabar having a longitadin'al'passage jformed in it and intersectingtransiversetool receiving passages, of tools located in said transverse receiving ,tool receivmg passages, a plunger mounted in said longitudinal passage, said tools and passages, a plungervmounted in said-longisitudinal passage, saidftoolsand plungerhaving cooperating wedgingsurfaces whereby when the plunger is axially adjusted in one direction the tools are adjusted transverselyof the bar, means for axially adjusting said .plun'ger, said plunger being mounted to permit its lower end to move transversely of the boring bar.

20. The combination with a boring bar formed with a longitudinal passage, trans- ,verse tool receiving passages intersecting said longitudinal passage, and another transverse passage intersecting the longitudinal passage at a distance from said tool receiving passages, oftools located in said tool receiving passages, a plunger mounted in said longitudinal passage, said tools and plunger having cooperating wedging surfaces whereby when theplunger is adjusted axially the tools are moved transversely of the boring bar, a second plun'ger located in saidbther transverse passage, the two plungershaving cooperating wedging surfaces whereb. when sa1d second plunger is moved in its receiving passage transversely of the boringbanithe first mentioned plunger is axially adjusted.

'21. The combination with a boring bar formed with a longitudinal passage, transverse tool receiving passages intersectingl said longitudinal passagey and another transverse passage intersecting the longitudinal passage at a distance from said tool passage, of tools located in said plunger having cooperatmg wedging surboring bar, a second plunger located in said other transverse passage, the twoplungers by whens'aid second plunger is moved in having cooperating wedging surfaces whereits receiving .passage transversely of the,

boring. bar, the first mentioned plungeris l axially adjusted, means for producing a substantialmovement of said second'plunger in its receiving passage transversely of the boring bar to throw tools into and out of the op- ,er'ative position, and provisions for obtainlng a micrometer ad ustment of sa1d second.

plunger ,to thereby obtain a micrometer adjustment ofathe tools,

22. Thecombination, with a'boring bar formed with a longitudinal passage, transverse tool receiving passages vintersecting said longitudinal passage, and another' transverse passage lntersecting the longitudinal passage at a distance from said tool receiving passages, of tools located in said" tool receiving passages, afplunger mounted in said longitudinal passage, sa1d tools and plungera' having cooperating wedging sura faces whereby when the plunger is adjusted axially" the 'tools are moved transversely oftheboringbar, a sec'ondpl unger located in iransversely of the boring bar, the first mensaid ether transverse passege, the tv vo plugimined extent, and provisions for maintaim.

gers having coiiperatmg wedging' surfaces inga transverse mlcr'ox eter adjustment of whereby when 884d second plunger is moved sard second plun r.

ge WYLLIS H. MARKLAND. 5 tioned plunger is axially adjusted, means Witnesses: 1

' carried by the bar for giving said second I. ,N. EABY,

' plunger a transverse movement of def/en \V, J. HAMO|R 

